Confinement of Fractional Excitations in a Triangular Lattice Antiferromagnet

L. Facheris, S. D. Nabi, A. Glezer Moshe, U. Nagel, T. Rõõm, K. Yu Povarov, J. R. Stewart, Z. Yan, A. Zheludev

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High-resolution neutron and THz spectroscopies are used to study the magnetic excitation spectrum of Cs2CoBr4, a distorted-triangular-lattice antiferromagnet with nearly XY-type anisotropy. What was previously thought of as a broad excitation continuum [L. Facheris et al., Phys. Rev. Lett. 129, 087201 (2022)PRLTAO0031-900710.1103/PhysRevLett.129.087201] is shown to be a series of dispersive bound states reminiscent of "Zeeman ladders"in quasi-one-dimensional Ising systems. At wave vectors where interchain interactions cancel at the mean field level, they can indeed be interpreted as bound finite-width kinks in individual chains. Elsewhere in the Brillouin zone their true two-dimensional structure and propagation are revealed.

Original languageEnglish
Article number256702
JournalPhysical Review Letters
Issue number25
StatePublished - 23 Jun 2023
Externally publishedYes


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